A 12-volt connector is used to join the electrical circuits from a 12-volt power source to other electrical equipment. A common use of 12-volt connectors is in automobiles, which use 12-volt connectors to join circuits from the battery to those of other electrical components, such as radios, fans and lights.
Connectors generally consist of a male plug that fits into a female receptacle or socket. Adapters can be used to join electrical devices with dissimilar connectors and provide portability to items that normally require power from standard electrical outlets. A frequently used adapter in automobiles plugs into the socket used for the cigarette lighter and allows users to power and charge electrical devices such as mobile phones and other portable devices.